You'll either need access to the internet on the machine or a USB device to transfer data from. I've seen some use their phone, but more commonly people will download drivers on another PC and put them on a jump drive / USB Drive. Then you transfer them over and run the applications/driver installations.
To find the drivers, you can go to your laptop manufacturers website and find their Support section, which will normally have a Downloads or Drivers sub-section. In here, they will ask you to narrow down the exact device you're on or enter the serial/model into a search box.
Then you'll just need to download the drivers needed there.